Effects of Bi addition on sintering and electrical properties of scandia stabilized zirocnia as intermediate-temperature SOFC electrolyte

Masashi Mori; Y. U. Liu; Shuhua Ma; Shin Ichi Hashimoto; Kenji Yasumoto

doi:10.5796/electrochemistry.77.184

Effects of Bi addition on sintering and electrical properties of scandia stabilized zirocnia as intermediate-temperature SOFC electrolyte

Masashi Mori, Y. U. Liu, Shuhua Ma, Shin Ichi Hashimoto, Kenji Yasumoto

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The compatibility of bismuth compounds as a sintering aid for (ZrO ₂)_0.89(ScO_1.5)_0.1(CeO ₂)_0.01 (ScSZ) electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs) has been discussed. Addition of 3 mol% BiO₁₅ considerably decreased the sintering temperature of ScSZ of approximately 200 °C and achieved the densification with a relative density above 95% at 1200°C. The solid solubility limit of BiO_1.5 in ScSZ was less than 2 mol%. Dispersion of Bi₂O₃ at the grain boundaries correspondingly accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 °C. At elevated temperatures of 450-750 °C, the electrical conductivity of the ScSZ after doping remained almost unchangeable in air and under reducing atmospheres. The results suggested that bismuth addition is promising to be applicable to a low-temperature co-firing fabrication of ScSZ based components for IT-SOFCs.

Original language	English
Pages (from-to)	184-189
Number of pages	6
Journal	Electrochemistry
Volume	77
Issue number	2
DOIs	https://doi.org/10.5796/electrochemistry.77.184
Publication status	Published - 2009 Feb

Keywords

Densification
Electrolyte
Scandia stabilized zirocnia
Sintering additions
Solid oxide fuel cells

ASJC Scopus subject areas

Electrochemistry

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10.5796/electrochemistry.77.184

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title = "Effects of Bi addition on sintering and electrical properties of scandia stabilized zirocnia as intermediate-temperature SOFC electrolyte",

abstract = "The compatibility of bismuth compounds as a sintering aid for (ZrO 2)0.89(ScO1.5)0.1(CeO 2)0.01 (ScSZ) electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs) has been discussed. Addition of 3 mol% BiO15 considerably decreased the sintering temperature of ScSZ of approximately 200 °C and achieved the densification with a relative density above 95% at 1200°C. The solid solubility limit of BiO1.5 in ScSZ was less than 2 mol%. Dispersion of Bi2O3 at the grain boundaries correspondingly accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 °C. At elevated temperatures of 450-750 °C, the electrical conductivity of the ScSZ after doping remained almost unchangeable in air and under reducing atmospheres. The results suggested that bismuth addition is promising to be applicable to a low-temperature co-firing fabrication of ScSZ based components for IT-SOFCs.",

keywords = "Densification, Electrolyte, Scandia stabilized zirocnia, Sintering additions, Solid oxide fuel cells",

author = "Masashi Mori and Liu, {Y. U.} and Shuhua Ma and Hashimoto, {Shin Ichi} and Kenji Yasumoto",

year = "2009",

month = feb,

doi = "10.5796/electrochemistry.77.184",

language = "English",

volume = "77",

pages = "184--189",

journal = "Electrochemistry",

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publisher = "Electrochemical Society of Japan",

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T1 - Effects of Bi addition on sintering and electrical properties of scandia stabilized zirocnia as intermediate-temperature SOFC electrolyte

AU - Mori, Masashi

AU - Liu, Y. U.

AU - Ma, Shuhua

AU - Hashimoto, Shin Ichi

AU - Yasumoto, Kenji

PY - 2009/2

Y1 - 2009/2

N2 - The compatibility of bismuth compounds as a sintering aid for (ZrO 2)0.89(ScO1.5)0.1(CeO 2)0.01 (ScSZ) electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs) has been discussed. Addition of 3 mol% BiO15 considerably decreased the sintering temperature of ScSZ of approximately 200 °C and achieved the densification with a relative density above 95% at 1200°C. The solid solubility limit of BiO1.5 in ScSZ was less than 2 mol%. Dispersion of Bi2O3 at the grain boundaries correspondingly accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 °C. At elevated temperatures of 450-750 °C, the electrical conductivity of the ScSZ after doping remained almost unchangeable in air and under reducing atmospheres. The results suggested that bismuth addition is promising to be applicable to a low-temperature co-firing fabrication of ScSZ based components for IT-SOFCs.

AB - The compatibility of bismuth compounds as a sintering aid for (ZrO 2)0.89(ScO1.5)0.1(CeO 2)0.01 (ScSZ) electrolyte in intermediate-temperature solid oxide fuel cells (IT-SOFCs) has been discussed. Addition of 3 mol% BiO15 considerably decreased the sintering temperature of ScSZ of approximately 200 °C and achieved the densification with a relative density above 95% at 1200°C. The solid solubility limit of BiO1.5 in ScSZ was less than 2 mol%. Dispersion of Bi2O3 at the grain boundaries correspondingly accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 °C. At elevated temperatures of 450-750 °C, the electrical conductivity of the ScSZ after doping remained almost unchangeable in air and under reducing atmospheres. The results suggested that bismuth addition is promising to be applicable to a low-temperature co-firing fabrication of ScSZ based components for IT-SOFCs.

KW - Densification

KW - Electrolyte

KW - Scandia stabilized zirocnia

KW - Sintering additions

KW - Solid oxide fuel cells

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SN - 1344-3542

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Effects of Bi addition on sintering and electrical properties of scandia stabilized zirocnia as intermediate-temperature SOFC electrolyte

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Keywords

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